Water jet exiting to atmosphere
I am a 2nd semester UG Mechanical Engineering student and have no background in CFD and COMSOL. I was given a project by my fluid mechanics professor and was sort of stuck I need to simulate a water...
View ArticleHow to plot time-dependent temperature profile at a point
Hi all, I have 1 question over here, i have been using the SAR head tutorial (Provided by comsol tutorial) to do research for my school project and i have 1 problem over here which is, i cant seems to...
View ArticlePDE General for Navier-Stokes equations
Hi I am trying to use PDE General module in COMSOL 4.2 to simulate Euler equations. I know that we have a Laminar Flow module than I can put viscosity equal to zero to have Euler equations but I would...
View Articlemixer simulation, CFD
Dear community, Can you help me with the following: Is there Comsol manual which has all the information about the rotating machinery which is an add-on of CFD ? I have followed the tutorials available...
View ArticleCentrifugal Force
Hi, I would like to include centrifugal force in my COMSOL (version 4.3a) model of a curved channel with laminar flow containing small particles. Is it necessary for COMSOL to find the first and second...
View ArticleLaminar and turbulent flow in the same interface
Hello everyone, I have a non-isothermal flow ( a melt and argon) and I would like to know if it is possible to simulate a lamnar flow (melt) and a turbulent flow (argon) on the same fluid flow...
View ArticleTwo phase fluid flow adding material color
Hello all, I am attempting to model the combination of three fluids in an angled T-mixer (two of them are being modeled as water, and the other is a non-newtonian fluid). I think I have the physics set...
View ArticleFluid flow in porous media
I'm modelling water flow in a cylindrical rock core under transient conditions. There, constant 'P' pressure is maintained at upstream and pressure built-up at downstream has to be investigated. Can...
View ArticleHow to add inertial lift force and Dean force
Hi everybody, I m doing simulation for inertial focusing. I need to see the effect of inertial lift force and dean force on particle. I m just wanted to know where these forces can be defined. I tried...
View ArticleModelling of phase change
Dear Comsol user, I have one conceptual question... I would like to model phase change of solid due to heat transfer from fluid above. Intuitively i should model the melting of solid using " heat...
View ArticleCoupling Pressure with EOF
I am modeling electroosmotic flow (EOF) in a microfluidic chip. The chip has 2 inlets and 1 outlet. The EOF part seems to be working well. I am using Electric Currents (ec) and Laminar Flow (spf)...
View ArticleWall condition (no slip or sliding), fluid outlet condition
Hi all, I am modeling a sphere moving in a moving laminar fluid domain (2D). The sphere is moved by the motion of the fluid, through boundary load on the sphere surface. I am wondering what kind of...
View ArticleFrequency dependent pressure waves
Hi, I am trying to apply pressure waves to a mass contained in a closed volume in order to make it vibrate. So far I got it to vibrate, but I can't seem to find a way to set the frequency of the waves....
View ArticleModelling seperation of ice and salt
Hello, I am a begginer at CFD modelling, with only basic experience in MATLAB with Euler Methods. My objective is to model the seperation of ice and salt from seawater. This occurs when a liquid is...
View Article(Two phase)Bubble shrink in a two phase flow
I want to simulate a bubble dynamics in the water. I initialize a bubble in the water, and use phase-field model. I give the water a velocity in a channel, the bubble moves with the water. After a few...
View ArticleUndefined value found in the equation residual vector.
I'm solving for lid driven cavity with stratified flow. My error message looks: Undefined value found. - Detail: Undefined value found in the equation residual vector. There are 3 degrees of freedom...
View ArticleCreeping flow through a hydrogel
Hi everyone, I am trying to model the diffusion (creeping flow) of molecules through a collagen type I hydrogel. Does anyone have any idea on how to model a portion of a microfluidic device that...
View ArticleError in Two Phase Flow
I am using the Level Set Method in Comsol. When I am using the Time dependent solvers I get the following error- Failed to find consistent initial values. Last time step is not converged. The same...
View ArticleCalculate Drag Coefficient
Background: simulate the drag coefficient for a truck model I have read the following post www.comsol.de/blogs/how-do-i-compute-lift-and-drag/ and looked at the flow over an Ahmed body example which...
View ArticleA Vortex Pair Impinging on a Solid Boundary
I am trying to model the Problem of 9.13 from Plawsky Transport Phenomena 3rd ed (below). Any ideas for how to set this up better? Thanks The method of images uses precisely oriented collections of...
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